Liquid counterbalance for tools.



No. 629,104. Y V Patented July ls, 1399.

l c. w. BoLsmGEa. LIQUID CUUNTERBALNCE FR TDLS.

(Application Bled Jan. 6, 1899.)

(No How-2 2 sheets-sheer l.

No. 629,101. menten my la, |899.

c. Mammalia. LIQUID CIUNTERBALANEE FDR TOULS.

(Application led Jim. 6, 1899.;

(In llodei.) 2 Sheets-Sheet y2.

LL i \\\\\\\\\k GJ v l) P4 uuuuuuuuu uw" N wrruusslsA millon mmmwwwm u balancesfor Tools', of whichthe vfollowing 'isv beinghad to vthe accompanying -drawingaf forming 'part of this' specification,infwhichef tically-movable cross-slidel of aheavy planer;

i desiredpoints. To the base 5 of the'cutter-, lbox is securedablocl; 6 by means of prof' iaway, cfa `met,ali-planer, constructed in ac Acordance with my invention.

lines 3.

. three-Way cocks 16,".having .exhaust-ports l UNITED. STATES? ,LIQUIDQCOUNTERB'ALANCE Foa T ocfnfrysqY srncrron'lrronronning part-,brunettes ratntnofaenoi, a1-.eu July 1s, i899.'

' n Applioatilrii iile'dyanuary initi-9.

Be it known that I,- CYRUS B'ofusntGER,-` of Homestead, in the countyof Allegheny and State oi'v Pennsylvaniaf'haye inventedl a newr z' and useful lmprovemen'tin `Liquid 'Cou n'terflf a full, clear, and exactdescription,-reference-L Figure 1 is a frontlelevation', partly broken ligxg?Y is an end elevation ot the same; Fig. .3 isan enlarged front elevation'of the cutter-box and. support. Fig. .4 is a horizontal section onthe line 1V 1V of Fig. 3, and Fig. 5 is a vertical section on the line V V of Fig. 3. f i My invention relates to that class of metalworking tools -Where the strain upon the toolholder is very heavy; and it is designed to provide an improved .counterbalancing device for the tool-holder 'whereby it may be accurately adjusted to the Work 'and when desired the tool may be easily raised, the Weight being taken E the adj listing-screws.

In the drawings, in' which I show my invention as applied to a metalplaner, 2 is the verin which the table isindicated by thedotted 4 4: arethe cutter-boxes, which aref supported upon this cross-slide in any desir able manner so as to be moved along'it to the jectingyvings '7, y'vhich are bolted to the base. Rigidly secured Within this block' are two Vertical cylinders 8 8, containing pistons 9 9, forming part voi hollowv piston.- rods 10 10,. Whichat'their upper ends are rigidly secured to the inward projection 11 of the verticallymovable tool-holder 12, which has a dovetail guide connection with the block 6, as shown'V A.

Fluid-press'ure, preferably in the form-'of compressed air, though oil, water, or other iiuid may beA used instead thereof, vis supplied l to the counterbalancingfcylinders by means. oi' flexible hose 13, which leadufroma supplyf pipe 14 to .the upper end of the tool-holder and communicate with passages 1 5 therein by leading to the open air.` The supplyfpipe 14:

isernia; No. 701,306. 'ruimten pump .being located part of thetranne.'r

fupon .any convenient .connected to a suitable, air-pump'll'bya A yvalvedrpipe18,asshoyvn.in Fig.2,rthis air# i., Y 55 f throughuthe Aupper end lof the block 6,-passes .through `ascreu threaded -hole lin .the in.-

-Wardly`fprojecting part 11 of the ,tool-holder, 'and has a stepped lower bearing in a hanged vplateO, asY lshown in Fig. 3.; The central jportionof7the blockti is suitablycut. away to 'Y receive the screw, and with a bevel'fwheel2l upon the lower end of the screw-shaft engages'the bevel-Wheel 22 upon a short counter-'shaft extending through the block 6 and having'at its rear end a bevel-gear connection 23 withv a shaft 24:, which extends through the` cross-slide and by means of which the tool may, be raised and lowered. J

` The operation is as follows: When it is desired toraise the tool and holder, pressure is supplied to the cylinders in the cutter-boxes suicient to more thanV counterbalance the Weight of the tool-holder and tools and that part of the cutter-holder engagingthe screw is lifted off the screw-threads, so that the screw may be easily rotated to lift the tools. In lowering the tools the pressure is exhausted from the cylinders by opening the three-Way valve 16, and the screws may be then rotated either by hand ori by theshaft 23,'soY as to allow the tools to descend.,r Then the tool and holder are lowered to the desired point landare exactly counterbalanced ork a little moreA than icounterbalanced, they are held in Working pov lsition thereby, so that too deep a cut cannot Y be made.Y

`The advantages of my invention will be apparent to those skilled inthe art since the uid counterbalance is much 'more simple and eiective and more easily regulatedy than the old counterweights whichl have been employed. The fluid exerts a constant lifting pressure upon the tool, so as to takeupany 1 backlash `in the feed-screw, thus giving a much finerV adj ustment than before, While the tool-holder Works more freely and the amount of'power necessary to operatethefeed is reduced to a minimum. The liquid-.pressure may be increased. or decreasedat will, andby IOO increasing the pressure slightly the screwholders may be lifted to their starting'posi- 

